var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
// 引入 token 验证规则
// const jwtAuth = require('./utils/auth');


//二级接口
var indexRouter = require('./routes/index');
var studentsRouter = require('./routes/students');
var imagesRouter = require('./routes/images');  //头像上传
var testsRouter = require('./routes/tests');  //头像上传

// 引入db.js里面连接数据库的代码
require('./db');


var app = express();

// CORS 处理跨域
var allowCrossDomain = function(req, res, next) {
    // 设置允许跨域访问的请求源（* 表示接受任意域名的请求）   
    res.header("Access-Control-Allow-Origin", "*");
    // 设置允许跨域访问的请求头
    res.header("Access-Control-Allow-Headers", "X-Requested-With,Origin,Content-Type,Accept,Authorization");
    // 设置允许跨域访问的请求类型
    res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");
    // 同意 cookie 发送到服务器（如果要发送cookie，Access-Control-Allow-Origin 不能设置为星号）
    res.header('Access-Control-Allow-Credentials', 'true');
    next();
};
app.use(allowCrossDomain);

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

// 让 token 验证生效
// app.use(jwtAuth);

// 匹配前段 ajax 的一级接口
app.use('/', indexRouter);
app.use('/students', studentsRouter);
app.use('/images', imagesRouter);  //头像上传
app.use('/tests', testsRouter);  //头像上传


// app.use('/users', usersRouter);
app.use('/tests', testsRouter);


// catch 404 and forward to error handler
app.use(function(req, res, next) {
    next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
    // set locals, only providing error in development
    res.locals.message = err.message;
    res.locals.error = req.app.get('env') === 'development' ? err : {};

    // render the error page
    res.status(err.status || 500);
    res.render('error');
});

// module.exports = app;
app.listen(3000, () => console.log(' 3000 服务器启动成功~'))